Construction Scale Models Not Actually Asking For The Answer To This Algebra Answer, I Just Need To Know How To Solve It?

Not actually asking for the answer to this algebra answer, I just need to know how to solve it? - construction scale models

In my work there is this problem, I can do, but I think that relations can not remember what the answer will, I would appreciate your help.

Stonehenge II in Hunt, Texas, is a model of the old building in Wiltshire, England. Og scale for the original model is 3:5. The altar of stone from the original building is 4.9 meters tall model tall.Find altar stone.